The study will compare the pharmacokinetics (PK), safety and tolerability of long-term infusion of lyophilized landiolol (LDLL600) against esmolol (Brevibloc) by measurement of blood concentrations of landiolol, esmolol and their metabolites, and by monitoring systemic cardiovascular and local tolerability, blood pressure (BP), ECG including heart rate (HR) and adverse events (AEs).